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# Sodium Phosphate Enema
## Overview
Sodium phosphate enemas are hypertonic saline solutions that draw water into the colon by osmosis, stimulating bowel evacuation.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically 1 pre-filled enema (4.5 ounces or 133 mL) administered 2-5 hours before the procedure. Some protocols may recommend a second dose if needed, but this should be guided by local protocol.
* **Constipation:** 1 pre-filled enema (4.5 ounces or 133 mL) as a single dose. Do not use more than 1 enema in a 24-hour period.
## Pediatric Dosing
* **Children 2 to < 12 years:** 1 pediatric enema (2.25 ounces or 66 mL) as a single dose.
* **Children < 2 years:** Not recommended due to increased risk of severe electrolyte abnormalities.
## Dose Adjustments
No dose adjustments are typically required based on renal or hepatic impairment. However, caution is advised in patients with any condition that may affect electrolyte balance.
## Contraindications
* Congenital or acquired megacolon.
* Ileus or intestinal obstruction.
* Bowel perforation.
* Severe renal impairment (e.g., Stage 3b or worse CKD, ESRD).
* Congestive heart failure.
* Hypersensitivity to sodium phosphate.
* Young children (< 2 years).
* Patients with impaired rectal absorption or retention.
* Patients on medications that prolong QT interval.
* Patients with electrolyte disturbances.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, renal tubular damage, cardiac arrhythmias, seizures.
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte imbalances (hypernatremia, hypocalcemia).
* **Drugs that prolong QT interval:** Increased risk of cardiac arrhythmias due to electrolyte disturbances.
* **ACE inhibitors, ARBs, NSAIDs:** May increase the risk of acute kidney injury in susceptible individuals.
## Monitoring
* Monitor for signs of electrolyte imbalance (nausea, vomiting, muscle cramps, confusion, arrhythmias).
* Monitor renal function and electrolytes (serum phosphate, calcium, sodium, potassium) in patients with risk factors or following repeated use.
## Clinical Pearls
* Instruct patients to retain the enema for the recommended time (usually 5 minutes or until bowel movement is imminent) to maximize efficacy.
* Avoid use in patients who cannot adequately retain the enema.
* Do not administer more frequently than recommended to avoid serious electrolyte disturbances.
* Ensure adequate hydration, especially in elderly patients or those with underlying medical conditions.
* Consider alternatives for patients with contraindications, particularly those with renal impairment or cardiac issues.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before administering any medication.*
